#include <iostream>
#include <algorithm>

using namespace std;

int main() {
    int a, b, c;
    cin >> a >> b >> c;

    int sorted[] = {a, b, c};
    sort(sorted, sorted + 3);

    int cnt = 0;
    if (sorted[1] == a || sorted[1] == c) {
        cnt = min(sorted[1] - sorted[0], sorted[2] - sorted[1]);
    }

    cout << cnt << endl;

    return 0;
}